package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额统计接口
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        // 需要构造dateList与turnoverList
        List<LocalDate> dateList = getDateList(begin, end);

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            // 查询当天的营业额
            // 当天开始与结束时刻
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 用户数据统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = getDateList(begin, end);
        List<Integer> totalUserList = new ArrayList<>();
        List<Integer> increaseUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            // 根据时间查询总用户以及新增用户
            // 用户总量：select count(id) from user where create_time < ?
            // 当日新增用户：select count(id) from user where create_time < ? and create_time > ?
            Map map = new HashMap();
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            map.put("begin", beginTime);
            Integer totalUser = userMapper.countByMap(map);
            totalUser = totalUser == null ? 0 : totalUser;
            totalUserList.add(totalUser);

            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            map.put("end", endTime);
            Integer increaseUser = userMapper.countByMap(map);
            increaseUser = increaseUserList == null ? 0 : increaseUser;
            increaseUserList.add(increaseUser);
        }


        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(increaseUserList, ","))
                .build();
    }

    /**
     * 订单数据统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = getDateList(begin, end);
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        Integer totalOrderCount = 0;
        Integer validOrderCount = 0;

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // 每日订单数：select count(id) from orders where order_time< ? and order_time> ?
            Integer dailyOrders = getIntegerStatics(beginTime, endTime, null);

            // 有效订单数：select count(id) from orders where order_time< ? and order_time> ? and status = ?\
            Integer validOrders = getIntegerStatics(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(dailyOrders);
            validOrderCountList.add(validOrders);
            totalOrderCount = totalOrderCount + dailyOrders;
            validOrderCount = validOrderCount + validOrders;

        }

        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 获取销量前10的套餐和菜品
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getTop10Statistics(LocalDate begin, LocalDate end) {
        List<GoodsSalesDTO> goodsList = orderMapper.getTop10Statistics(begin, end);

        List<String> goodsNameList = new ArrayList<>();
        List<Integer> goodsNumberList = new ArrayList<>();
        for (GoodsSalesDTO goods : goodsList) {
            goodsNameList.add(goods.getName());
            goodsNumberList.add(goods.getNumber());
        }
        String nameList = StringUtils.join(goodsNameList, ",");
        String numberList = StringUtils.join(goodsNumberList, ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    /**
     * 导出运营数据报表
     *
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response){
        // 1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        // 查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        // 2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            // 基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            // 获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            // 填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            // 获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            // 获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            // 填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                // 查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                // 获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            // 3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            // 关闭资源
            out.close();
            excel.close();} catch (IOException e) {
            throw new RuntimeException(e);
        }

    }


    private Integer getIntegerStatics(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);

        Integer result = orderMapper.countByMap(map);
        if (result == null) {
            result = 0;
        }
        return result;
    }

    private List<LocalDate> getDateList(LocalDate begin, LocalDate end) {
        // 需要构造dateList与turnoverList
        List<LocalDate> dateList = new ArrayList<>();

        while (!(begin.compareTo(end) > 0)) { // 开始日期小于结束日期
            dateList.add(begin);
            begin = begin.plusDays(1);
        }
        return dateList;
    }
}
